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Understanding Record Repro

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Fatmangolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2017 at 10:40pm
This is a great thread. The web is full of myths and repeated opinions, this is where we hear from experts testing and explaining what they hear!

Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2017 at 4:04am
Originally posted by Graham Slee Graham Slee wrote:

Back to my pet subject: heterodyning; it is also known as sum and difference. Two frequencies mix to produce their sum, and their difference. The sum is higher in frequency; the difference is lower in frequency.

I was recently made aware of this video of Peter Ledermann...



And at 19 minutes in, he talks about sum and difference regarding moving coil. The resonant frequencies of the cantilever which he discusses seem to correlate, and so it is possible that the sum and difference frequencies he talks about do exist.

Since making a buffer or isolation stage which reduces the effect of the high frequency interference discussed in the early part of this topic, the audible effects of those are vastly attenuated.

It works because the transistor used is a power transistor, which having a much smaller base spreading resistance is lower in noise than small signal transistors, but being a power transistor it hasn't the same high frequency gain. Added to this are input resistor/capacitor filters which do not load the cartridge, but simply attenuate the high frequency interference.

Still, after many weeks burn-in there is brightness, and I can only put this down to the resonance of which Peter Ledermann speaks. Otherwise the sound is far more musical, and I suppose, for those used to hearing moving coil, will sound just right. I am getting used to this more musical brightness, which without the interference heterodyning isn't anywhere so harsh as it was.

 I thought this needs a refresh on the forum. Others may have missed the video and Graham's important comments above.
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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